content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2013, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * ---------------
   * Annotation.java
   * ---------------
   * (C) Copyright 2009-2013 by Object Refinery Limited and Contributors.
   *
   * Original Author:  Peter Kolb (see patch 2809117);
   * Contributor(s):   ;
   *
   * Changes:
   * --------
   * 20-Jun-2009 : Version 1 (PK);
   *
   */
  
  package org.jfree.chart.annotations;
  
  import org.jfree.chart.event.AnnotationChangeEvent;
  import org.jfree.chart.event.AnnotationChangeListener;
  
  /**
   * The base interface for annotations.  All annotations should support the
   * {@link AnnotationChangeEvent} mechanism by allowing listeners to register
   * and receive notification of any changes to the annotation.
   */
  public interface Annotation {
  
      /**
       * Registers an object for notification of changes to the annotation.
       *
       * @param listener  the object to register.
       */
      public void addChangeListener(AnnotationChangeListener listener);
  
      /**
       * Deregisters an object for notification of changes to the annotation.
       *
       * @param listener  the object to deregister.
       */
      public void removeChangeListener(AnnotationChangeListener listener);
  
  }
  